JPS595906Y2 - Knee-lever switch operation device for electronic musical instruments - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a twenty-one lever switch operating device for an electronic musical instrument.

In electronic musical instruments, in order to be able to obtain a sustain effect at will without using the hands while playing, an operating lever called a 21 lever is provided at a location corresponding to the performer's right knee. When the player pushes this lever in a predetermined direction with his right knee, the sustain effect switch is turned on and a sustain effect is obtained.

As an example of such a switch operating device, one having a structure as shown in FIGS. 1 to 3 is known.

That is, the second lever 3, which is rotatably attached to the lower surface of the shelf board 1 of the electronic musical instrument via the mounting brackets 2, 2, and which normally hangs below the shelf board 1 during performance, is Against the force of the spring 5 provided between the tip 3a and the spring support member 4 provided on the upper surface of the shelf board 1,
When pushed in the direction of arrow A until a part of the lever comes into contact with one of the stopper members 6 provided on the bottom surface of the shelf board 1, the tip 3a of this lever 3 causes the switch provided on the top surface of the shelf board 1 to be moved. A drive piece 9 rotatably attached to the support member 7 via a shaft 8 is rotated counterclockwise in FIG. 2 against the force of a bar spring 11 together with an actuator 10 implanted at one end thereof. As a result, the movable contact piece 13 of the switch 12 attached to the switch support member 7 is released from the pressure applied by the actuator 10, moves away from the upper fixed contact piece 14, and moves to the lower fixed contact piece 15. This causes the switch 12 to switch and turn on, producing a sustain effect.

When the pressing operation on the knee lever 3 is stopped from this state, the knee lever 3 is rotated in the direction of arrow B by the force of the spring 5 and returns to the original hanging position, and the driving piece 9 is accordingly moved by the force of the bar spring 11. The actuator 10 pushes up the movable contact piece 13 and brings it into contact with the upper fixed contact piece 14, which switches the switch 12 and returns it to its original position. It is designed to be in the off state.

In addition, if you want to obtain a sustain effect continuously for a certain period of time during a performance, move the second lever 3 in the hanging state in the direction of arrow B so that a part of it is connected to the other stopper member provided on the lower surface of the shelf board 1. 16, the knee lever 3 is held in that position by the action of the spring 5, and the actuating piece 1 welded to a predetermined location on the knee lever 3
7, the drive piece 9 is rotated counterclockwise in FIG. 2 against the force of the bar spring 11, and as a result, the switch 12 is turned on and turned on in the same way as in the case described above. It is designed to be retained.

Incidentally, this state is also a state in which the twenty-one lever 3 is stored under the shelf board 1 when not in use.

However, in such a conventional switch operating device, the part that switches the switch 12 has a large number of parts, and the structure of this part is not only complicated, but also extremely troublesome to assemble. The drawback was that the cost increased by 1.

In addition, since the part to which the actuating piece 17 of the knee lever 3 is attached is normally nine rods with a diameter of about 8 mm, it is extremely difficult to weld the actuating piece 17 to these nine rods as designed. If this welding strength is weak, there is a drawback that the actuating piece 17 may come off.

Furthermore, since the switch 12 is mechanically switched, it has short lifespan, may malfunction, and has poor reliability.

This idea was devised in view of the above circumstances.The number of parts is small, the structure is simple and easy to assemble, and there is no need for conventional welding work, resulting in an easy cost reduction. The purpose of this device is to provide a two-lever one-set switch operation device for an electronic musical instrument that can be used to perform timekeeping, and uses a reed switch as the switch, and a magnet is attached to the rotating shaft that is a part of the two-lever. The reed switch is configured to be switched by the rotation of the magnet in conjunction with the rotation of the twenty-one lever.

An embodiment of this invention will be described below with reference to FIGS. 4 to 6.

In the figure, reference numeral 21 denotes a shelf board of an electronic musical instrument, on which a rectangular hole 22 is formed at a predetermined position, and a casing 23 is attached to the lower surface of the shelf board as will be described later.

The casing 23 is made of plastic or resin, and has circular holes 24 formed at a plurality of predetermined locations, and U-shaped holes 24 at two predetermined locations. grooves 25, 25 are formed, respectively.

Stopper support members 268 to 26C made of synthetic resin are bonded to predetermined locations on the upper surface of the casing 23, and one stopper member 27 is attached to these stopper support members 26a to 26C by screws 28 and 26C. It is installed by...

This one stopper member 27 has a retaining surface 29 consisting of a vertical surface on the left side in FIGS. 4 and 5, and a stopper surface 30 inclined at a predetermined angle on the right side thereof.
and a pair of projecting pieces 31. which further extend in parallel toward the right. 31.

A buffer member 32 is bonded to a stopper surface 30 of this one stopper member 27.

Further, the other stopper member 33 made of resin is adhered to a predetermined location on the upper surface of the casing 23, and a buffer member 34 is adhered to the upper surface of this stopper member 33.

In the grooves 25, 25 of the casing 23, a rotation shaft 36, which is a part of the double lever 35, is connected to both protruding pieces 31. of the one stopper member 27. It is rotatably fitted in contact with the lower surface of 31.

A round bar 37 is welded to a predetermined location of the rotating shaft 36 and planted so as to be orthogonal to the rotary shaft 36.
are both protruding pieces 31. of the one stopper member 27. 31
is held in between.

That is, the rotation shaft 36 of the knee lever 35 is connected to the groove 25. of the casing 23. 25 and is prevented from moving in the left-right direction, and the grooves 25 of the casing 23 and the protruding piece 31 of one stopper member 27. 31, and furthermore, the round bar 37 is prevented from moving in the vertical direction by both protruding pieces 31.31 of one stopper member 27. It is rotatably attached to the casing 23 in a state where movement in the front and rear directions is prevented by being supported between the two.

A resin spring support member 3B is bonded to a predetermined location on the upper surface of the casing 23.

The spring support member 38 has a substantially inverted U-shaped cross section, and a groove 39 having a substantially T-shaped cross section is formed on the lower surface of its upper wall, extending in the left-right direction.

This groove 39 has a spring locking member 4 having a substantially inverted Ω-shaped cross section.
0 is slidably fitted and fixed to the earthen wall of the spring support member 3B by screws 41.

A spring 4 is provided in the groove 42 of this spring locking member 40.
One hook 431 of the spring 43 is locked, and the other hook 43b of the spring 43 is locked in a groove 44 formed at the tip of the round bar 37.

In addition, the spunong support member 3 of the spring locking member 40
8, when the knee lever 35 hangs straight down below the shelf board 21 as shown by the solid line in FIGS. This position is such that it does not act on the lever 35 at all.

At predetermined locations on the upper surface of the casing 23 on both sides of the rotation shaft 36 in the radial direction, there are switch support members 45 made of resin and having a substantially U-shaped cross section. 45 are adhered to each other.

Grooves 46, 46 in these switch support members 45, 45
For example, both sides of a switch mounting plate 48 on which a reed switch 47 for obtaining a sustain effect is mounted are fitted respectively.

Note that this switch mounting plate 48 has a recess 49 through which the rotation shaft 36 is inserted.

The rotation shaft 3 is rotated at a position corresponding to the reed switch 47.
A four-pole ring magnet 50 is fitted in a predetermined position of 6.

The positional relationship between the 4-pole ring magnet 50 and the reed switch 47 is as follows when the double lever 35 is hung straight below the shelf board 21 as shown by the solid line in FIGS. 5 and 6. As shown in FIG. 6, the S pole of the 4-pole ring magnet 50 faces the contact part of the reed switch 47, and from this state the lever 35 is rotated in the direction of arrow C or D as described later. 5 and 6, the four-pole ring magnet 50 rotates in the same direction as the rotation shaft 36 of the knee lever 35.
The four-pole ring magnet 50 is positioned approximately midway between the N and S poles to face the contact portion of the reed switch 47.

Further, as shown in FIG. 7, the reed switch 47 is in an OFF state when its contact portion faces the N pole or S pole of the 4-pole ring magnet 50; The magnet 50 is configured to be in an on state when facing approximately midway between the north pole and the south pole.

Next, a case will be described in which the unitized switch operating device as described above is attached to the shelf board 21.

In this case, each component provided on the upper surface side of the square casing 23 is inserted into the hole 22 of the shelf board 21 from below, and the engaging surface 29 of one stopper member 27 is inserted into the corresponding wall surface of the hole 22 of the shelf board 21. 22 a for positioning, and the mounting surface of the casing 23 is brought into contact with the lower surface of the shelf board 21, and then a screw (not shown) is inserted into the circular hole 24 of the casing 23 and screwed into the shelf board 21, thereby The unitized switch operating device as described above is attached to the shelf board 21.

Next, the operation of the switch operating device having the above structure will be explained.

Assume that the knee lever 35 is now in a position hanging straight below the shelf board 21, as shown by the solid line in FIGS. 5 and 6.

If you want to temporarily obtain a sustain effect during performance, move the lever 35 in the direction of arrow C against the force of the spring 43 so that its round bar 37 is glued to the stopper surface 30 of one stopper member 27. When the reed switch 47 is rotated until it comes into contact with the buffer member 32, that is, to the position shown by the dashed line in FIGS. This turns on the reed switch 47 and provides a sustain effect.

On the other hand, when the rotation operation on the 21 lever 35 is stopped from this state, the 21 lever 35 is rotated in the direction of arrow D by the force of the spring ring 43 and returns to its original state shown by the solid line in FIGS. 5 and 6. Along with this, the four-pole ring magnet 50 also returns to its original position and its S pole faces the contact portion of the reed switch 47, thereby turning off the reed switch 47.

Next, if you want to obtain a sustain effect continuously for a certain period of time during performance, move the knee lever 35 in the direction of arrow D against the force of the spring 43 so that the round bar 37 is connected to the other stopper member 3.
3 until it comes into contact with the buffer member 34 bonded to the top surface of the 4-pole ring magnet 50, that is, to the position shown by the two-dot chain line in FIGS. faces the contact portion of the reed switch 47, which turns on the reed switch 47 and provides a sustain effect.

In this state, even if the rotation operation of the twenty-one lever 35 is stopped, the twenty-one lever 35 is held at the position by the action of the spring 43.

Next, if you want to release this state, press the knee lever 35.
When the knee lever 35 is rotated in the direction of arrow C, the knee lever 35 is returned to its original position shown by the solid line in FIGS. 5 and 6 by the action of the spring 43.

The state shown by the two-dot chain line in FIGS. 5 and 6 is also the state in which the lever 35 is stored under the shelf board 21 when not in use.

Further, in the above embodiment, the stopper support member 26
1 to 26 C, stopper member 33, spring support member 38, and switch support member 45. 45 and the like are respectively adhered to predetermined locations of the casing 23, but they may all be integrally formed by bonding or resin, and the present invention is not limited to the above embodiment.

Furthermore, in the above embodiment, one quadrupole ring magnet 5
One reed switch 47 is provided for 0, but
For example, as shown in FIGS. 8 and 9, a plurality of reed switches 47 may be provided for one four-pole ring magnet 50. A plurality of four-pole ring magnets may be provided on the rotating shaft 36 of the lever 35, and a reed switch may be provided corresponding to each of these four-pole ring magnets.

Furthermore, instead of the 4-pole ring magnet, a ring magnet with even more poles, such as 8-pole or 16-pole ring magnet, may be used.

As explained in detail above, according to the two-lever one-set switch operation device for an electronic musical instrument according to this invention, a reed switch is used as the switch, and a magnet is attached to the rotating shaft that is a part of the two-lever. Since the reed switch is configured to be switched by the rotation of the magnet in conjunction with the rotation of the twenty-one lever, the number of parts is reduced and the structure is simple and easy to assemble. Moreover, the conventional welding work is no longer required, which in turn allows for a reasonable cost reduction, and since the switch can be switched magnetically, it has a long life and is highly reliable. It has the effect of

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an example of a two-lever switch operation device in a conventional electronic musical instrument, and FIG. 2 is a diagram showing II of FIG.
- Longitudinal cross-sectional view along line II, Figure 3 is ni-n of Figure 1.
A partially omitted vertical cross-sectional view taken along line R, FIG. 4 is a plan view showing an embodiment of the twenty-one lever switch operating device for an electronic musical instrument according to this invention, and FIG. 6 is a partially omitted longitudinal sectional view taken along line VI-VI in FIG. 4, FIG. 7 is a diagram for explaining the characteristics of the reed switch, and FIG. FIG. 9, which is a plan view of a part of the embodiment, is a longitudinal sectional view taken along the line IX-IX in FIG. 8. 21... Shelf board, 23... Casing, 27... Stopper member, 33... Stopper member, 35... Twenty-one lever, 36... Rotating shaft, 37... Round bar, 43...
・Spring, 45...Switch support member, 47...
・Reed switch, 48...Switch mounting plate, 50・
...4-pole ring magnet.

Claims (1)

[Scope of utility model registration request] A two-lever switch operating device for an electronic musical instrument in which a switch is changed by rotating a two-lever hanging below a shelf, wherein the switch is operated by a reed switch, and An electronic device characterized in that a magnet is attached to a rotating shaft that is a part of the two-lever, so that the reed switch is switched by the rotation of the magnet as the two-lever rotates. A two-lever switch operating device for musical instruments.